Dell S2340T Multi User Manual page 27

Contrast Adjust Brightness first, and then adjust Contrast only if further adjustment is necessary.
Push the
The Contrast function adjusts the degree of difference between darkness and lightness on the monitor screen.
Input Source Use the Input Source menu to select between different video signals that may be connected to your monitor.
Auto Select
Press
HDMI
Select HDMI input when you are using the HDMI connector. Press the
DisplayPort
Select DisplayPort input when you are using the DisplayPort (DP) connector. Press the
USB
Select USB input when you are using the USB monitor. Press the
Color Settings
Use the Color Settings to adjust the color setting mode and color temperature.
There are different color-setting sub-menus for HDMI/DisplayPort.
button to increase contrast and push the
to select Auto Select, the monitor auto detects either the HDMI input or the DislpayPort input or USB input.
button to decrease contrast (min 0 ~ max 100).
button to select the HDMI input source.
to select the DisplayPort input source.
button to select the USB input source.